R-VALUE: 40.0, SUITABLE FOR: new construction, retrofitTHERMAL PERFORMANCE: At R-3.5 per in., the cellulose in this system yields an overall value of R-40.PROS:• Familiar building process means lower labor costs with readily available materials.• If cellulose is used, the project has a lower environmental impact.• Large moisture-storage capacity allows wall cavities to dry gradually.CONS:• Fairly involved insulation process can add to labor costs.• Reduces interior space by 3%.
The Balloon Framed Steel Stud Parapet— This is the ugliest parapet to get right. Notice the use of spray polyurethane foam, the high density stuff, to provide air control layer continuity across the balloon framed exterior steel stud wall. The spray foam is supported by horizontal bridging or metal blocking. This is a tricky thing to execute and, as such, we design into the upper parapet assembly a pathway for drying via diffusion to provide some performance redundancy.